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In this paper, we propose a simple linear multiuser precoding scheme for downlink cellular systems with a decode- and forward (DF) based relay, where the available information at a base station (BS) and a relay station (RS) is asymmetric. The proposed scheme not only eliminates the interference from a RS for the mobile station (MS) served by a BS but also provides the MS supported by a RS with a macro...
In this paper, we studied the method that improves the downlink performance of cellular relay system in multiple-cell environment by using cognitive radio. When relay stations in the network have spectrum agility, they can establish downlink channels which are orthogonal to downlink of base station. In this way, interference between base station and relay station can be reduced and spectral resource...
In this paper, we propose two operating scenarios of employing cognitive radio to downlink of relay networks. The first scenario uses ISM band while the second scenario exploits opportunity of channel use at UHF spectrum. The capacity gain over conventional relay is investigated in terms of the normalized system capacity. We first statistically model the spectrum usage pattern in those bands and derive...
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